Round corner rolling strengthening machine capable of easily adjusting circular arc meshing angle

Abstract

The invention discloses a fillet rolling strengthening machine capable of easily adjusting an arc meshing angle, relates to the technical field of strengthening and rolling of aviation fasteners, and solves the problem that an existing strengthening machine is difficult to accurately adjust the meshing angle between a rolling wheel and a workpiece. The fillet strengthening machine comprises a rolling device, the rolling device comprises two rolling wheels which are arranged symmetrically at an adjustable interval, the two rolling wheels can deflect up and down along a vertical plane so as to clamp or loosen a workpiece, at least part of the outer circumferential surface of each rolling wheel protrudes upwards in the circumferential direction to form a rolling part, and the rolling parts are arranged on the outer circumferential surface of each rolling wheel. A rolling cambered surface is formed in the circumferential direction of the rolling part; and the two angle adjusting mechanisms are used for adjusting the contact angles of the two rolling wheels and the workpiece respectively, and each angle adjusting mechanism comprises an angle adjusting seat which can deflect up and down around a rotating center and along an arc-shaped track. The fillet rolling strengthening machine has the advantages of being simple in structure, simple in angle adjustment, small in position change and the like.

Description

Technical Field

[0001] This invention relates to the field of aerospace fastener strengthening rolling technology, and in particular to a round corner rolling strengthening machine with easily adjustable arc engagement angle. Background Technology

[0002] The fillet rolling strengthening process applied to the transition area between the bolt head and shank of high-strength fasteners, such as aviation bolts, strengthens the arc by applying positive rolling pressure. This generates compressive stress on the surface of the metal arc, improving the surface roughness and increasing the density of the metal material at the arc connection. This helps prevent and avoid the formation of micro-cracks on the arc at the head-shank connection of the bolt under frequent tensile stress, ultimately ensuring flight safety for various aircraft and spacecraft connected by aviation bolts.

[0003] Existing corner rolling strengthening machines, such as those disclosed in CN113231789A, CN114669642A, and CN113245460A, employ two rolling rollers. When adjusting the relative angle of the two rolling rollers, they use an angle adjustment mechanism achieved through a rotating shaft. Specifically, a horizontally positioned push rod cooperates with a spring located below the rolling roller assembly, causing the rolling rollers to deflect up and down around a horizontal rotating shaft, thus achieving angle adjustment. However, this angle adjustment is inaccurate. The existing corner rolling strengthening machines' shaft angle adjustment mechanism confuses the adjustment of the engagement angle between the rolling roller's arc and the workpiece's arc with the adjustment of the unloading clearance angle. The engagement angle refers to the contact angle between the arc surface of the rolling roller and the arc surface of the workpiece to be processed; the unloading clearance angle refers to the rolling roller automatically rising a certain angle during unloading to release the workpiece for easier loading and unloading.

[0004] For flat-head bolts, if there is only one pivot for angle adjustment, and the clearance angle is too small, the gap between the rolling roller and the workpiece will be too small, making it difficult to unload the part. If the clearance angle is increased to widen the gap for easier unloading, the rolling roller will interfere with the lower plane of the flat head of the bolt. This is because there is no separate meshing angle adjustment mechanism specifically designed for the large rolling roller to mesh with the workpiece's arc, resulting in the inability to adjust the precise meshing angle between the rolling roller's arc and the flat head's arc.

[0005] For corner roll forming machines, the main parameter determining the shape of the roll forming roller is the arc size. Whether machining flat-head (90° angle between head and rod) or countersunk (120-135° angle between head and rod) bolts with the same arc parameter, only one set of roll forming rollers corresponding to the arc is needed for interchangeable machining to ensure standardization. If the machine tool lacks an arc engagement adjustment mechanism, then for flat-head and countersunk bolts, to guarantee the basic arc engagement length, roll forming rollers with different tilt angles are required, even though the arcs on the rollers are the same. This compensates for the inconsistency in roller standardization caused by the lack of an arc engagement angle adjustment mechanism.

[0006] In other words, existing fillet strengthening machines use an angle adjustment mechanism with only one rotating shaft. This mechanism is used to adjust both the workpiece blanking angle and the meshing angle of the two arcs. Without specially customized non-standard rolling rollers, this is unstable and extremely cumbersome to adjust. Moreover, many types of parts cannot be adjusted to achieve the ideal balance between the two angles, leading to unstable equipment operation and substandard parts processing. If non-standard rolling rollers are used, not only will costs increase significantly, but the lack of standardized management of the rolling rollers will also result in a poor user experience. Since the rolling rollers used for flat head bolts and countersunk bolts are different, it is easy to confuse the rolling rollers in actual production. Summary of the Invention

[0007] The purpose of this invention is to solve the above-mentioned problems by designing a rounded corner rolling strengthening machine that is easy to adjust the arc meshing angle, thus solving the problem that existing strengthening machines are difficult to accurately adjust the meshing angle between the rolling wheel and the workpiece.

[0008] The technical solution of the present invention to achieve the above objectives is a fillet rolling strengthening machine with an easily adjustable arc meshing angle, comprising: A rolling device includes two rolling rollers with adjustable spacing and symmetrical arrangement. The two rolling rollers can deflect up and down in a vertical plane to clamp or release the workpiece. At least part of the outer circumferential surface of the rolling rollers is raised upward along the circumferential direction to form a rolling part. The rolling part is formed with a rolling arc surface in the circumferential direction. The arc of the rolling arc surface is adapted to the arc of the R angle of the part to be strengthened on the workpiece. Two angle adjustment mechanisms are provided to adjust the contact angle between the two rolling rollers and the workpiece to adapt to different types of workpieces. The angle adjustment mechanism includes an angle adjustment seat that can rotate up and down around a rotation center and along an arc trajectory. The rotation center is close to the position of the workpiece when it enters between the two rolling rollers. The angle of the two rolling rollers can be adjusted by moving the angle adjustment seat.

[0009] To ensure stable sliding of the angle adjustment seat, the angle adjustment mechanism also includes an angle adjustment drive seat that slides in contact with the bottom surface of the angle adjustment seat. The contact surfaces between the angle adjustment drive seat and the angle adjustment seat are both arc surfaces, and the curvature of the arc surface is adapted to the deflection trajectory of the angle adjustment seat.

[0010] To facilitate the deflection of the driving angle adjustment seat along an arc trajectory, the angle adjustment mechanism further includes a drive shaft rotatably connected to the bottom of the angle adjustment seat, a rotating shaft rotatably connected to the angle adjustment drive seat, and an angle adjustment screw that passes through the rotating shaft and the drive shaft in sequence along a direction perpendicular to the axial direction and is threadedly connected to the drive shaft. The angle adjustment screw is rotatably connected to the rotating shaft.

[0011] To ensure stable deflection of the angle adjustment seat, an arc-shaped groove extending along the deflection trajectory of the angle adjustment seat is provided on the angle adjustment drive seat. Arc-shaped guide holes are provided on both sides of the arc-shaped groove, and the two ends of the drive shaft are respectively located in the guide holes on both sides of the arc-shaped groove.

[0012] To facilitate the installation of the drive shaft, the bottom of the angle adjustment seat protrudes downward to form a connecting part, and the drive shaft is rotatably connected to the connecting part.

[0013] In order to limit the deflection angle of the angle adjustment seat, angle limiting blocks are respectively provided on both sides of the connecting part. The two angle limiting blocks are respectively embedded in the guide holes on both sides of the arc groove and can slide relative to the guide holes.

[0014] To reduce wear on the drive shaft, detachable end caps are provided at both ends of the drive shaft, and the end caps are embedded in the guide hole.

[0015] In order to precisely control the deflection angle of the angle adjustment seat, a scale is provided on both sides of the angle adjustment seat. The scale on the scale is set along the deflection trajectory of the angle adjustment seat. An angle scale corresponding to the scale is provided on both sides of the angle adjustment drive seat. The angle scale has an indicator line pointing to the specific scale on the scale.

[0016] As a preferred technical solution, the fillet rolling strengthening machine also includes: The pressure bar is capable of moving downward to press the workpiece down, causing the two rolling rollers to deflect downward to clamp the workpiece, and the pressure bar is capable of passively rotating under the influence of the workpiece; A spacing adjustment mechanism is used to adjust the spacing between two rolling rollers. The spacing adjustment mechanism includes two sliding bases that can move along the spacing direction of the two rolling rollers and an adjustment block that can move along a direction perpendicular to the spacing direction of the two rolling rollers. The angle adjustment mechanism is mounted on the sliding bases.

[0017] In order to precisely control the movement of the sliding base, the sliding base is slidably mounted on the slide plate. The spacing adjustment mechanism also includes a spacing adjustment screw rotatably connected to the slide plate and two inclined positioning blocks. The two inclined positioning blocks are respectively fixedly installed on opposite sides of the two sliding bases, and the two sides of the adjustment block respectively cooperate with the inclined surfaces of the two inclined positioning blocks.

[0018] Its advantages over existing technologies are: The high-precision rounded corner rolling strengthening machine provided by this invention has advantages such as simple structure, easy angle adjustment, and small positional changes. When adjusting the contact angle between the two rolling rollers and the aviation bolt, it is only necessary to rotate the angle adjustment seat around a rotation center and along an arc trajectory, thereby changing the contact angle between the rolling part of the rolling roller and the aviation bolt. This achieves the adjustment of the meshing angle between the arc surface of the rolling roller and the arc surface of the part of the aviation bolt to be processed. The rolling roller itself can rotate up and down in a vertical plane, realizing the adjustment of the blanking clearance angle of the rolling roller. In other words, the blanking clearance angle and the meshing angle are adjusted separately, which not only meets the working conditions requirements of rolling strengthening processing but also meets the processing requirements of different types of aviation bolts.

[0019] Compared to the traditional method of adjusting the angle of the rolling roller by deflecting it around a horizontal axis, the adjustment method of this application places the rotation center of the rolling roller closer to the aircraft bolt, thus minimizing the change in the relative position between the rolling roller and the aircraft bolt. The blanking clearance angle and the engagement angle can be adjusted separately, achieving a better balance between the two.

[0020] The contact surfaces between the angle adjustment seat and the angle adjustment drive seat are both curved surfaces. These curved surfaces are designed according to the deflection trajectory of the angle adjustment seat to ensure that the angle adjustment seat and the angle adjustment drive seat always maintain surface-to-surface contact. This prevents the contact surfaces of the angle adjustment seat and the angle adjustment drive seat from deforming and ensures the accuracy of angle adjustment. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the fillet rolling strengthening machine; Figure 2 This is a schematic diagram showing the engagement of the pressure bar and the two rolling rollers; Figure 3 This is a schematic diagram of the installation structure of the spacing adjustment mechanism, the angle adjustment mechanism, and the rolling device; Figure 4 This is a schematic diagram of the spacing adjustment mechanism on the slide plate; Figure 5 This is a schematic diagram of the slide plate structure; Figure 6 This is a schematic diagram of the adjusting block; Figure 7 This is a schematic diagram of the installation structure of the angle adjustment mechanism, the yaw component, the servo drive mechanism, and the rolling wheel; Figure 8 This is an exploded structural diagram of the angle adjustment mechanism; Figure 9 This is a schematic diagram of the installation structure of each component on the angle adjustment drive unit; Figure 10 This is a schematic diagram of the bottom structure of the angle adjustment seat; Figure 11 This is an exploded view of the yaw component; Figure 12 This is a schematic diagram of the bottom structure of the rotating platform; Figure 13 This is a schematic diagram of the roller structure; Figure 14 This is a schematic diagram of rounding and strengthening small-diameter aviation bolts; Figure 15 This is a schematic diagram of rounding and strengthening large-diameter aviation bolts.

[0022] In the diagram, 1. Frame; 2. Backplate mounting base; 3. Slide mounting plate; 4. Slide plate; 401. Slide groove; 402. Mounting groove; 5. Spacing adjustment mechanism; 501. Adjusting block; 5011. Scale line; 5012. Waist-shaped hole; 502. Angled positioning block; 503. Spacing adjustment screw; 504. Screw positioning block; 6. Angle adjustment mechanism; 601. Angle adjustment drive seat; 6011. Arc groove; 6012. Guide hole; 602. Angle adjustment seat; 6021. Connecting part; 603. Rotating shaft; 604. Drive shaft; 605. Angle limit block; 606. End cover; 607. Angle scale; 608. Scale; 60 9. Angle adjustment screw; 7. Oscillating assembly; 701. Rotary table; 7011. Hinge; 7012. Limiting groove; 702. Deflection shaft; 703. Return spring; 704. Adjusting top rod; 8. Servo drive mechanism; 801. Servo motor; 802. Reducer; 803. Motor mounting base; 9. Lifting control module; 10. Main shaft assembly; 11. Bearing sleeve; 12. Pressure rod; 13. Rolling roller; 1301. Rolling part; 1302. Rolling arc surface; 14. Sliding base; 15. Wedge-shaped pressure plate; 16. Stop rod; 17. Fixing block; 18. Pointer dial; 19. Screw fixing sleeve; 20. Knob; 1001. Clearance hole. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0024] A preferred embodiment of the present invention proposes a fillet rolling strengthening machine with an easily adjustable arc engagement angle. Compared with traditional strengthening machines, this rolling strengthening machine can meet the rolling strengthening requirements of aviation bolts with different diameters and lengths, as well as the rolling strengthening requirements of different types of aviation bolts. At the same time, it can precisely adjust the angle of the rolling wheel, and the relative position change between the rolling wheel and the aviation bolt is very small.

[0025] For details, see Figures 1-3 The rounded corner rolling strengthening machine mainly includes a frame 1, a lifting control module 9, a main shaft component 10, a pressure rod 12, a rolling device, an angle adjustment mechanism 6, a spacing adjustment mechanism 5, and other modules.

[0026] The pressure rod 12 is installed at the lower end of the main shaft component 10, and the lifting control module 9 is used to control the lifting and lowering of the pressure rod 12. The rolling device is located below the pressure rod 12, and the angle adjustment mechanism 6 and the spacing adjustment mechanism 5 are used to adjust the angle and spacing between the two rolling rollers 13 of the rolling device to adapt to different types and models of aviation bolts.

[0027] The frame 1 is provided with a slide mounting plate 3 and a slide plate 4. The slide mounting plate 3 is fixedly mounted on the frame 1 by bolts, and the slide plate 4 is fixedly mounted on the slide mounting plate 3 by bolts. Therefore, both are easy to disassemble.

[0028] See Figure 5 A groove 401 is formed along the length of the upper surface of the slide plate 4. One side wall of the groove 401 is an inclined plane that slopes outward from top to bottom along the width of the groove 401, so that the cross-section of the groove 401 gradually increases from top to bottom. The other side wall of the groove 401 is a vertical plane.

[0029] See Figure 4 The slide groove 401 contains two sliding bases 14 and two wedge-shaped pressure plates 15, with the two sliding bases 14 corresponding to two angle adjustment mechanisms 6 respectively. The angle adjustment mechanisms 6 are mounted on the sliding bases 14.

[0030] Two sliding bases 14 are located within the slide groove 401 near its two ends. The two sides of the sliding base 14 corresponding to the two side walls of the slide groove 401 also have inclined surfaces, so one side of the sliding base 14 and the inclined side wall of the slide groove 401 are in inclined engagement. The wedge-shaped pressure plate 15 is located on the other side of the sliding base 14.

[0031] One side of the wedge-shaped pressure plate 15 is a vertical plane, and the other side is an inclined plane. The vertical plane on one side of the wedge-shaped pressure plate 15 is in close contact with the vertical sidewall of the slide groove 401, and the other side is also in contact with the sliding base 14 via an inclined plane. Bolt holes are provided at corresponding positions on the bottom surface of the slide groove 401, and correspondingly, bolt holes are also provided on the wedge-shaped pressure plate 15. Bolts pass through the bolt holes and are threadedly connected to the slide plate 4. By tightening the bolts, the wedge-shaped pressure plate 15 is pressed down, and the wedge-shaped pressure plate 15 will press the sliding base 14 through the inclined plane, thus fixing the sliding base 14 in the slide groove 401. When it is necessary to adjust the position of the sliding base 14, simply rotate the bolts to loosen the wedge-shaped pressure plate 15.

[0032] like Figure 4 As shown, the spacing adjustment mechanism 5 mainly consists of an adjusting block 501, a spacing adjusting screw 503, and two inclined positioning blocks 502. The two inclined positioning blocks 502 are fixedly installed on opposite sides of the two sliding bases 14. The opposite sides of the two inclined positioning blocks 502 are inclined surfaces, and they respectively cooperate with the inclined surfaces on both sides of the adjusting block 501.

[0033] Grooves are provided on the front and rear sides of the inclined positioning block 502, so that bolts can be used to fix the inclined positioning block 502 onto the sliding base 14 through the grooves. This eliminates the need to drill holes in the inclined surface of the inclined positioning block 502, reducing damage to the inclined surface.

[0034] The adjusting block 501 is a wedge-shaped block with inclined surfaces on both sides, so its overall shape is similar to an isosceles trapezoid. The inclined surfaces on both sides of the adjusting block 501 are in close contact with the inclined surfaces on the two inclined positioning blocks 502. The moving direction of the adjusting block 501 is perpendicular to the moving direction of the sliding base 14.

[0035] When it is necessary to increase the distance between the two rolling rollers 13, the adjusting block 501 is moved forward. The two sides of the adjusting block 501 will press the inclined positioning block 502 through the inclined surface, thereby pressing the two sliding bases 14, causing the two sliding bases 14 to move in opposite directions and the distance between them to increase, thus finally achieving the adjustment of the distance between the two rolling rollers 13.

[0036] See also Figure 4A fixing block 17 and a stop rod 16 are respectively provided at both ends of the slide plate 4 at the slide groove 401. The fixing block 17 is transversely cut into the slide groove 401. The slide plate 4 has mounting grooves 402 on both sides of the slide groove 401 for placing the fixing block 17. The two ends of the fixing block 17 are respectively embedded into the mounting grooves 402 and then fixed to the slide plate 4 with bolts.

[0037] The stop rod 16 is a screw. One end of the stop rod 16 passes through the fixing block 17 and abuts against the side of the sliding base 14 away from the inclined positioning block 502, thus limiting the sliding base 14. The stop rod 16, together with the adjusting block 501, limits the movement of the sliding base 14 on both sides to prevent it from moving.

[0038] The stop rod 16 and the fixing block 17 are connected by a thread. A knob 20 is installed on the end of the stop rod 16 away from the sliding base 14 for easy rotation of the stop rod 16. A screw fixing sleeve 19 is provided on the side of the fixing block 17 near the sliding base 14. The screw fixing sleeve 19 is fixedly installed on the side of the fixing block 17. The stop rod 16 passes through the screw fixing sleeve 19, which guides the stop rod 16 so that the end face of the stop rod 16 contacts the side wall surface of the sliding base 14. This prevents the sliding base 14 from easily shifting to the side where the stop rod 16 is located.

[0039] When the distance between the two rolling rollers 13 needs to be reduced, the adjusting block 501 is moved backward. At the same time, the stop rod 16 is rotated, which pushes the two sliding bases 14 to move towards each other until the two inclined positioning blocks are in close contact with the inclined surfaces on both sides of the adjusting block 502 again. In this way, the distance between the two rolling rollers 13 is reduced.

[0040] A receiving groove perpendicular to the slide groove 401 is formed in the middle area of ​​the upper surface of the slide plate 4 to accommodate the adjusting block 501. A screw positioning block 504 is provided at the narrowest end of the receiving groove near the adjusting block 501. This screw positioning block 504 is fixedly mounted to the side of the slide plate 4 by screws. One end of the spacing adjusting screw 503 passes through the screw positioning block 504 and is threadedly connected to the adjusting block 501. The spacing adjusting screw 503 and the screw positioning block 504 are rotatably connected, and the spacing adjusting screw 503 will not axially move relative to the screw positioning block 504.

[0041] Two guide keys are also installed in the receiving groove. These two guide keys are parallel to each other and extend along the moving direction of the adjusting block 501. The bottom of the adjusting block 501 is provided with a corresponding guide groove. The guide keys slide with the guide groove to guide the movement of the adjusting block 501.

[0042] When the pitch adjustment screw 503 is rotated, the pitch adjustment screw 503 will pull or push the adjustment block 501 to move, thereby realizing the adjustment of the pitch.

[0043] In other technical solutions, one end of the spacing adjustment screw 503 passes through the screw positioning block 504 and is rotatably connected to the adjusting block 501. The spacing adjustment screw 503 and the screw positioning block 504 are threaded together, so rotating the spacing adjustment screw 503 can also drive the adjusting block 501 to move.

[0044] like Figure 4 As shown, in order to facilitate the rotation of the pitch adjustment screw 503, a knob 20 is installed at the end of the pitch adjustment screw 503 away from the adjustment block 501.

[0045] like Figure 6 As shown, an elongated oval clearance hole 1001 is provided in the middle area of ​​the adjusting block 501. The clearance hole 1001 extends along the moving direction of the adjusting block 501, which facilitates the adaptation of the bolt processing position after the spacing adjustment is completed, ensuring that the bolt processing position remains unchanged. The clearance hole 1001 is vertically continuous, allowing long bolts to pass through it, facilitating the rounding device to perform fillet reinforcement processing on long bolts.

[0046] Correspondingly, clearance holes 1001 are also provided at corresponding positions on the slide plate 4, slide mounting plate 3 and frame 1 to make way for the processing of long bolts. The lower end of the long bolt can pass through the clearance hole 1001.

[0047] See Figure 4 , Figure 6 On the upper surface of the adjusting block 501, corresponding to the two inclined surfaces, there are scale lines 5011. Correspondingly, a pointer dial 18 is installed on the upper surface of each inclined positioning block 502, with the tip of the pointer dial 18 pointing to a certain mark on the scale line 5011. When the adjusting block 501 moves, the distance between the two sliding bases 14 can be determined by the specific mark pointed to by the tip of the pointer dial 18, and ultimately, the specific amount of adjustment of the distance between the two rolling rollers 13 can be determined. This makes the distance adjustment digital and also helps to improve the accuracy of the distance adjustment.

[0048] like Figure 6 As shown, oblong holes 5012 are respectively provided on both sides of the clearance hole 1001 on the adjusting block 501. Each oblong hole 5012 is provided with a fastening bolt (not shown in the figure), which passes through the oblong hole 5012 and is threaded to the slide plate 4. After the spacing of the adjusting blocks 501 is adjusted, the adjusting blocks 501 can be fixed on the slide plate 4 by tightening the fastening bolts to prevent them from sliding.

[0049] A countersunk hole is provided on the upper side of the waist-shaped hole 5012 on the adjusting block 501 to embed the head of the fastening bolt and prevent the head of the fastening bolt from protruding from the upper surface of the adjusting block 501 and affecting the processing.

[0050] like Figures 7-9 As shown, the angle adjustment mechanism 6 mainly consists of components such as an angle adjustment drive seat 601, an angle adjustment seat 602, a drive shaft 604, a rotating shaft 603, an angle adjustment screw 609, and an angle limit block 605. The angle adjustment drive seat 601 is fixedly mounted on the sliding base 14 by bolts. The upper surface of the sliding base 14 has a mounting groove 402 for mounting the angle adjustment drive seat 601.

[0051] An arc-shaped groove 6011 is formed on the angle adjustment drive seat 601. The arc-shaped groove 6011 extends from top to bottom along an arc-shaped trajectory. The contact surfaces of the upper surface of the angle adjustment drive seat 601 and the bottom surface of the angle adjustment seat 602 are both arc surfaces, which also extend at an angle from top to bottom. The curvature of the arc-shaped groove 6011 is basically consistent with the curvature of the arc surface.

[0052] See Figure 10 The bottom of the angle adjustment seat 602 protrudes downward to form a connecting portion 6021. When the angle adjustment seat 602 is installed on the angle adjustment drive seat 601, the connecting portion 6021 extends into the arc-shaped groove 6011, and the arc surfaces on both sides of the bottom of the angle adjustment seat 602 at the connecting portion 6021 slide in contact with the arc surfaces on the angle adjustment drive seat 601. Because the angle adjustment seat 602 and the angle adjustment drive seat 601 are in surface-to-surface contact, the angle adjustment drive seat 601 can withstand a large load and is not easily deformed.

[0053] See Figure 9 Mounting holes are provided on both side walls of the angle adjustment drive seat 601 near the upper end of the arc-shaped groove 6011. The two ends of the rotating shaft 603 are rotatably connected to the two mounting holes respectively via bushings. A through-hole is provided in the middle region of the rotating shaft 603, perpendicular to the axial direction of the rotating shaft 603. The angle adjustment screw 609 passes through this through-hole and is rotatably connected to it. That is, the angle adjustment screw 609 will not move axially; only rotational motion occurs between the angle adjustment screw and the rotating shaft 603.

[0054] A hinge hole is provided on the connecting part 6021 at the bottom of the angle adjustment seat 602, and a bushing is provided in the hinge hole. The drive shaft 604 is rotatably connected to the connecting part 6021 through the bushing.

[0055] See also Figures 7-9Guide holes 6012 are provided on both sides of the arc-shaped groove 6011 of the angle adjustment drive seat 601. These guide holes 6012 are arc-shaped, with an arc consistent with the arc of the bottom surface of the angle adjustment seat 602. An end cap 606 is installed at each end of the drive shaft 604. The end cap 606 is cylindrical and fixed to the end of the drive shaft 604 with screws. The end caps 606 at both ends of the drive shaft 604 extend into the guide holes 6012 on both sides, which guide the movement of the end caps 606. There is a certain gap between the end caps 606 and the inner walls of the guide holes 6012; they do not contact each other. When the angle adjustment screw 609 rotates, it drags the drive shaft 604, thereby causing the angle adjustment seat 602 to slide along the arc surface.

[0056] A threaded hole is provided in the middle region of the drive shaft 604, and the threaded hole extends through the drive shaft 604 in a direction perpendicular to its axial direction. The angle adjustment screw 609 passes through the threaded hole and is threadedly connected to it.

[0057] When adjusting the tilt angle of the angle adjustment seat 602, simply rotate the angle adjustment screw 609. The angle adjustment screw 609 will push or pull the angle adjustment seat 602 to deflect along an arc-shaped trajectory, thereby adjusting the angle of the two rolling rollers 13. When the angle adjustment seat 602 deflects, the rotating shaft 603 and the drive shaft 604 will also rotate, and the angle adjustment screw 609 will also deflect along an arc-shaped trajectory. Its rotation center is approximately above the middle area between the two rolling rollers, that is, approximately at the location of the aviation bolt. This allows adjustment of the meshing angle between the rolling arc surface of the two rolling rollers 13 and the arc surface of the part of the aviation bolt to be strengthened.

[0058] Because the meshing angle and the material clearance angle are adjusted separately, a good balance can be achieved. Figure 14 and Figure 15 These are schematic diagrams showing the rounding reinforcement of small-diameter and large-diameter aviation bolts, respectively. The small-diameter bolts are countersunk bolts, and the large-diameter bolts are flat-head bolts. Depending on the diameter and type of the aviation bolts, the meshing angle between the two rolling rollers 13 and the aviation bolts can be adjusted by the angle adjustment mechanism 6.

[0059] To facilitate the rotation of the angle adjustment screw 609, a knob 20 is installed at the upper end of the angle adjustment screw 609 (i.e., the end away from the drive shaft 604). A clearance groove is also provided on the angle adjustment drive seat 601 to allow space for the deflection of the angle adjustment screw 609.

[0060] Two angle limiting blocks 605 are provided, which are rotatably connected to both sides of the connecting part 6021 at the bottom of the angle adjusting seat 602 via pins, and are located on the lower side of the end cover 606. The two angle limiting blocks 605 are respectively embedded into the guide holes 6012 on both sides of the arc-shaped groove 6011.

[0061] The angle limiting block 605 has the following three functions: First, because one end of the angle limiting block 605 is thicker and the other end is thinner, the diameter of the thinner end is consistent with the diameter of the guide hole 6012, so it contacts the inner wall of the guide hole 6012. The diameter of the thicker end is larger than the diameter of the guide hole 6012, so it extends to the outside of the guide hole 6012. The thicker ends of the two angle limiting blocks 605 extend from both sides of the angle adjustment drive seat 601, which plays a limiting role in the axial direction of the drive shaft 604. Second, it plays a guiding role in the movement of the angle adjustment seat 602 along the arc trajectory. Third, it plays a limiting role in the deflection angle of the angle adjustment seat 602.

[0062] A scale 608 is provided on both sides of the angle adjustment seat 602, and the scale on the scale 608 is set along the deflection trajectory of the angle adjustment seat 602. Correspondingly, an angle scale 607 is provided on both sides of the angle adjustment drive seat 601, and the angle scale 607 has an indicator line that points to a certain mark on the scale 608. When the angle adjustment seat 602 deflects, the specific deflection angle of the angle adjustment seat 602 can be determined by the scale 608, so as to accurately adjust the deflection angle.

[0063] When the angle adjustment seat 602 is installed on the angle adjustment drive seat 601, its upper surface is inclined, so the yaw component 7 installed on the angle adjustment seat 602 is also inclined.

[0064] like Figure 3 As shown, the rolling device mainly consists of two oscillating components 7, two servo drive mechanisms 8, and two rolling rollers 13. The oscillating components 7, servo drive mechanisms 8, and rolling rollers 13 are in one-to-one correspondence and are symmetrically distributed with respect to the adjusting block 501.

[0065] like Figure 11 , Figure 12 As shown, the oscillation assembly 7 mainly consists of a rotating platform 701, a deflection shaft 702, and a return spring 703. The bottom of the rotating platform 701 protrudes downward to form a hinge portion 7011 with rounded corners. The hinge portion 7011 has a hinge hole. A bushing is fitted onto the deflection shaft 702 and is rotatably connected to the hinge hole. Therefore, the rotating platform 701 can oscillate up and down in the vertical plane via the deflection shaft 702.

[0066] A groove for accommodating the hinge portion 7011 is formed on the upper surface of the angle adjustment seat 602. The deflection shaft 702 is located in the groove, and its two ends are rotatably connected to the two side walls of the groove, respectively. There is a certain gap between the bottom surface of the rotating table 701 and the upper surface of the angle adjustment seat 602 to provide sufficient deflection space for the rotating table 701. The rotating table 701 can deflect up and down relative to the angle adjustment seat 602 through the deflection shaft 702.

[0067] Specifically, an inclined surface is provided on the upper surface of the angle adjusting seat 602 near the rolling roller 13, and a stop bolt (not shown in the figure) is provided on the bottom of the rotating table 701 away from the rolling roller 13. The stop bolt is threaded to the bottom of the rotating table 701. After the rotating table 701 is reset, the stop bolt will abut against the upper surface of the angle adjusting seat 602. By rotating the stop bolt, the position angle of the rotating table 701 after reset can be adjusted, that is, the adjustment range of the material discharge avoidance angle of the two rolling rollers.

[0068] Because the deflection angle of the rotating table 701 is small, the angle change of the rolling rollers 13 will not be too large, which is sufficient for the two rolling rollers 13 to clamp and loosen the aviation bolts. During unloading, the two rotating tables 701 deflect upward under the action of the return spring 703 and return to their original position. The two rolling rollers 13 will then loosen the aviation bolts, allowing for unloading and reloading. This adaptive adjustment is the adjustment of the unloading avoidance angle.

[0069] The return spring 703 is also located in the groove on the upper surface of the angle adjustment seat 602. The upper and lower ends of the return spring 703 abut against the angle adjustment seat 602 and the rotating table 701, respectively. A limit groove 7012 is also provided at the bottom of the rotating table 701, and the upper end of the return spring 703 will be embedded in the limit groove 7012.

[0070] A circular hole is provided in the groove on the upper surface of the angle adjustment seat 602. An adjustment rod 704 is provided in the circular hole. The lower end of the return spring 703 is sleeved on the adjustment rod 704. By moving the adjustment rod 704 up and down, the return spring force of the return spring 703 on the rotating table 701 can be adjusted.

[0071] Multiple long bolts are provided on both sides of the angle adjusting seat 602. The long bolts pass laterally through the angle adjusting seat 602 and abut against the adjusting rod 704 inside the round hole, fixing the adjusting rod 704 inside the round hole. The long bolts and the angle adjusting seat 602 are connected by threads.

[0072] like Figure 7As shown, the servo drive mechanism 8 is mounted on the rotary table 701. This servo drive mechanism 8 mainly consists of a servo motor 801, a reducer 802, a motor mounting base 803, and a main shaft. The motor mounting base 803 is fixedly mounted on the rotary table 701 with bolts. The reducer 802 is mounted on the motor mounting base 803. The output end of the servo motor 801 is connected to the input end of the reducer 802, and the output end of the reducer 802 is connected to the main shaft. The main shaft and the motor mounting base 803 are rotatably connected via bearings. The rolling roller 13 is mounted on the main shaft via a cover and screws. The cover is used to press the rolling roller 13 tightly onto the main shaft, and the screws secure the cover to the main shaft.

[0073] The rolling roller 13 is rotated by a servo motor 801, and the execution signals of the two servo motors 801 are synchronized, so the rotation of the two rolling rollers 13 is also synchronized. Since the rolling roller 13 is independently controlled by each servo motor 801, the number of rotations of the rolling roller 13 can be precisely controlled.

[0074] See Figure 13 A portion of the outer circumferential surface of the roller 13 protrudes outward to form a ring-shaped rolling part 1301. The rolling part 1301 and the main body of the roller 13 are connected by a conical transition surface, so the shape of the roller 13 is similar to a frustum.

[0075] A rolling arc surface 1302 with a certain curvature is formed on the circumferential surface of the rolling part 1301. The curvature of the rolling arc surface 1302 is adapted to the R-angle curvature of the connection between the head and the shank of the aviation bolt.

[0076] The two rolling rollers 13 are arranged opposite each other with a certain gap between them. The aircraft bolt to be processed will extend into this gap. The width of this gap is smaller than the diameter of the aircraft bolt head, so that when the pressure rod 12 presses down on the aircraft bolt, the head of the aircraft bolt will press down on the two rolling rollers 13, causing the two rolling rollers 13 to deflect towards each other and clamp the aircraft bolt. The rolling arc surfaces 1302 on the two rolling rollers 13 will roll into contact with the part of the aircraft bolt to be processed.

[0077] During the roll forming process, the servo motor 801 drives the roll forming rollers 13 to rotate. The two roll forming rollers 13 squeeze the aviation bolt while driving the aviation bolt to rotate. The pressure rod 12 that presses down the aviation bolt will also be passively rotated under the action of static friction and driven by the aviation bolt.

[0078] like Figure 1As shown, the lifting control module 9 is located above the rolling roller 13 and is fixedly mounted on the back plate mounting seat 2 on the frame 1. The main shaft component 10 is mounted on the lower end of the lifting control module 9. The upper end of the bearing sleeve 11 extends into the main shaft component 10, and the upper end of the pressure rod 12 extends into the bearing sleeve 11 and is rotatably connected to it through the bearing.

[0079] The lifting control module 9 drives the main shaft in the main shaft component 10 to rotate via a motor. The main shaft is linked with the lead screw, which in turn drives the lead screw to rotate, thereby moving the bearing sleeve 11 up and down, ultimately controlling the lifting of the pressure rod 12.

[0080] A pressure sensor is installed inside the spindle assembly 10, which can detect the pressure of the pressure rod 12 when pressing down the aviation bolt and the rolling roller 13.

[0081] During the processing of the aerospace bolt, the pressure rod 12 is controlled to move downwards, pressing down the aerospace bolt and the two rolling rollers 13. The rotating table 701 deflects downwards relative to the angle adjustment seat 602, and the two rolling rollers 13 clamp the aerospace bolt. The rolling arc surface 1302 on the outer circumference of the rolling rollers 13 makes rolling contact with the part of the aerospace bolt to be processed. Then, two servo motors 801 drive the two rolling rollers 13 to rotate synchronously. The aerospace bolt also rotates under the drive of the rolling rollers 13, and the pressure rod 12 also rotates under the drive of the aerospace bolt. The pressure sensor detects the downward pressure in real time, and the magnitude of the pressure determines whether the aerospace bolt has completed the rolling reinforcement.

[0082] After the two rolling rollers 13 have completed the rolling and strengthening of the aviation bolt, the pressure rod 12 moves upward. At this time, under the action of the return spring 703, the two rotating tables 701 will deflect upward and return to their original positions. The two rolling rollers 13 will then loosen the aviation bolt, making it easier to remove the aviation bolt.

[0083] The above technical solutions only embody the preferred technical solutions of the present invention. Any modifications that may be made by those skilled in the art to certain parts thereof embody the principles of the present invention and fall within the protection scope of the present invention.

Claims

1. A fillet rolling strengthening machine with easily adjustable arc meshing angle, characterized in that, include: A rolling device includes two rolling rollers (13) with adjustable spacing and symmetrical arrangement. The two rolling rollers (13) can deflect up and down in a vertical plane to clamp or release the workpiece. The outer circumferential surface of the rolling rollers (13) is at least partially raised upward along the circumferential direction to form a rolling part (1301). The rolling part (1301) is formed with a rolling arc surface (1302) in the circumferential direction. The arc of the rolling arc surface (1302) is adapted to the arc of the R angle of the part to be strengthened on the workpiece. Two angle adjustment mechanisms (6) are used to adjust the contact angle between the two rolling rollers (13) and the workpiece to adapt to different types of workpieces. The angle adjustment mechanism (6) includes an angle adjustment seat (602) that can rotate up and down around a rotation center and along an arc trajectory. The rotation center is close to the position of the workpiece when it enters between the two rolling rollers (13). The angle of the two rolling rollers (13) can be adjusted by moving the angle adjustment seat (602).

2. The fillet rolling strengthening machine with easily adjustable arc meshing angle according to claim 1, characterized in that, The angle adjustment mechanism (6) further includes an angle adjustment drive seat (601) that slides in contact with the bottom surface of the angle adjustment seat (602). The contact surfaces between the angle adjustment drive seat (601) and the angle adjustment seat (602) are both arc surfaces, and the curvature of the arc surface is adapted to the deflection trajectory of the angle adjustment seat (602).

3. The fillet rolling strengthening machine with easily adjustable arc meshing angle according to claim 2, characterized in that, The angle adjustment mechanism (6) further includes a drive shaft (604) rotatably connected to the bottom of the angle adjustment seat (602), a rotating shaft (603) rotatably connected to the angle adjustment drive seat (601), and an angle adjustment screw (609) that passes through the rotating shaft (603) and the drive shaft (604) in a direction perpendicular to the axial direction and is threadedly connected to the drive shaft (604). The angle adjustment screw (609) and the rotating shaft (603) are rotatably connected.

4. The fillet rolling strengthening machine with easily adjustable arc meshing angle according to claim 3, characterized in that, The angle adjustment drive seat (601) has an arc-shaped groove (6011) extending along the deflection trajectory of the angle adjustment seat (602). Arc-shaped guide holes (6012) are provided on both sides of the arc-shaped groove (6011). The two ends of the drive shaft (604) are respectively located in the guide holes (6012) on both sides of the arc-shaped groove (6011).

5. The fillet rolling strengthening machine with easily adjustable arc meshing angle according to claim 4, characterized in that, The bottom of the angle adjustment seat (602) protrudes downward to form a connecting part (6021), and the drive shaft (604) is rotatably connected to the connecting part (6021).

6. The fillet rolling strengthening machine with easily adjustable arc meshing angle according to claim 5, characterized in that, Angle limiting blocks (605) are respectively provided on both sides of the connecting part (6021). The two angle limiting blocks (605) are respectively embedded in the guide holes (6012) on both sides of the arc groove and can slide relative to the guide holes (6012).

7. The fillet rolling strengthening machine with easily adjustable arc meshing angle according to claim 4, characterized in that, The drive shaft (604) is provided with detachable end caps (606) at both ends, and the end caps (606) are embedded in the guide hole (6012).

8. The fillet rolling strengthening machine with easily adjustable arc meshing angle according to claim 2, characterized in that, The angle adjustment seat (602) is provided with scales (608) on both sides. The scales on the scales (608) are set along the deflection trajectory of the angle adjustment seat (602). The angle adjustment drive seat (601) is provided with angle scales (607) on both sides corresponding to the scales (608). The angle scales (607) have indicator lines pointing to the specific scales on the scales (608).

9. The fillet rolling strengthening machine with easily adjustable arc meshing angle according to claim 1, characterized in that, The fillet rolling strengthening machine also includes: The pressure bar (12) can move downward to press the workpiece down, so that the two rolling rollers (13) deflect downward to clamp the workpiece, and the pressure bar (12) can be passively rotated under the drive of the workpiece. The spacing adjustment mechanism (5) is used to adjust the spacing between the two rolling rollers (13). The spacing adjustment mechanism (5) includes two sliding bases (14) that can move along the spacing direction of the two rolling rollers (13) respectively and an adjustment block (501) that can move along the spacing direction perpendicular to the two rolling rollers (13). The angle adjustment mechanism (6) is mounted on the sliding bases (14).

10. The fillet rolling strengthening machine with easily adjustable arc meshing angle according to claim 9, characterized in that, The sliding base (14) is slidably mounted on the slide plate (4). The spacing adjustment mechanism (5) further includes a spacing adjustment screw (503) rotatably connected to the slide plate (4) and two inclined positioning blocks (502). The two inclined positioning blocks (502) are respectively fixedly installed on opposite sides of the two sliding bases (14). The two sides of the adjustment block (501) respectively cooperate with the inclined surfaces of the two inclined positioning blocks (502).

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